16. The units of the Planck constant h are those of: A) energy B) power C) momen

Question

16. The units of the Planck constant h are those of: A) energy B) power C) momentum D) angular momentum E) frequency 17. Consider the following energies: 1. minimum energy needed to excite a hydrogen atom 2. energy needed to ionize a hydrogen atom 3. energy released in ^235U fission 4. energy needed to remove a neutron from a ^12C nucleus Rank them in order of increasing value. A) 1,2,3,4 B) 1,3,2,4 C) 1,2.4,3 D) 2,1,4,3 E) 2,4,1,3 18. Nuclear fusion in the Sun is increasing its supply of: A) hydrogen B) helium C) nucleons D) positrons E) neutrons 19. Most of the energy produced by the Sun is due to: A) nuclear fission B) nuclear fusion C) chemical reaction D) gravitational collapse E) induced emf^' s associated with the Sun^?s magnetic field 20. Which one of the following represents a fusion reaction that would yield large amounts of energy?

Explanation / Answer

there are multple questions so I can only answer one question

1) the unit's of plank's constant h are those of

answer ) angular momentum

Reason :

units of h:

E=h f => h=E/f= Joule/(1/sec) = kgm^2/s^2/(1/sec) = kgm^2/s

units of angular momentum:

L= m v r = kg*m/s*m = kgm^2/s=> h has same units

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